/**
 * Created by Administrator on 2017/10/7/007.
 */
import java.util.LinkedList;
public class Linkedlist extends LinkedList {

    @Override
    public Object removeFirst() {
        return super.removeFirst();
    }

    @Override
    public boolean contains(Object o) {
        return super.contains(o);
    }

    @Override
    public boolean add(Object o) {
        return super.add(o);
    }

    @Override
    public boolean remove(Object o) {
        return super.remove(o);
    }
}
